Independent costs, scores and savings data for spray foam insulation in the UK. Free comparison tool and local installer matching.
Spray foam insulation is applied to roof timbers or wall surfaces. While thermally effective, it carries significant risks that outweigh its benefits for most UK homeowners.
| Factor | Detail |
|---|---|
| Our Independent Score | 4.0/10 |
| Typical Cost (semi-det) | £1,000–£2,500 |
| Annual Energy Saving | £100–£200/yr |
| Payback Period | 8–15 years |
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⚠ Spray foam warning: Multiple major UK mortgage lenders decline applications on homes with spray foam on roof timbers. Removal costs £2,500–£10,000. We rate it 4.0/10 and do not recommend it for most properties. See our full spray foam risks guide.